CN102917516A - Method for resolving excess temperature of constant current driving chips and light-emitting diode (LED) lamp bar driving circuit - Google Patents
Method for resolving excess temperature of constant current driving chips and light-emitting diode (LED) lamp bar driving circuit Download PDFInfo
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
- H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
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Abstract
The invention provides a method for resolving excess temperature of constant current driving chips and a light-emitting diode (LED) lamp bar driving circuit. The method includes step1 providing double-channel constant current driving chips with each constant current driving chip comprising a first input pin, a second input pin, a first output pin, a second output pin and a control pin; step2 providing LED lamp bars, resistors, a control source and a power supply; step3 enabling one end of one LED lamp bar to be connected with the power supply and the other end of the LED lamp bar to be connected with the first input pin, enabling one end of the other LED lamp bar to be connected with a ground wire and the other end to the LED lamp bar to be connected with the second input pin, simultaneously enabling one end of one resistor to be connected with the first output pin and the other end of the resistor to be connected with the ground wire, enabling one end of the other resistor to be connected with the second output pin and the other end of the other resistor to be connected with the ground wire and enabling the control source to be connected with the control pin; step4, repeating the step3 till the LED lamp bars with required number are connected; and step5 connecting the control source and the power supply to drive the LED lamp bars.
Description
Technical field
The present invention relates to the LED lamp and drive the field, relate in particular to a kind of method and LED lamp bar drive circuit that solves the constant-current driven chip excess Temperature.
Background technology
Light-emitting diode (LED, Light Emitting Diode) be a kind of solid state light emitter, utilize electronics in the semiconductor and hole to combine and send photon, the color that every kind of LED sends depends on the energy of photon, and the energy of photon is different because of its manufactured materials.The emission wavelength of commaterial is very approaching, and therefore the color of every LEDs is all very pure, and mostly the LED of modal general brightness is redness and grass green.The LED crystallite dimension is little, and color category is many, during use arrangement mode have again very large flexibly, this is its place more superior than general light source; In addition, LED compares the reliability that also has higher light efficiency and Geng Gao with other light sources, and the method for power supply is also fairly simple.Thereby LED is especially suitable for use as display light source.
The same with general semiconductor PN, the forward conduction voltage drop of LED is also little with the variation of On current, is generally about 3.5V, and its illumination is that electric current is large along with its electric current that passes through increases, and light output and illumination are also large.So LED requires to adopt series-fed, and is the power supply of constant current, the electric current of the pipe of flowing through is definite value, to keep stable light output, as the driving chip of LED, requires its output device that constant-current characteristics is arranged, and the LED that connects is powered.
See also Fig. 1, in order to reduce cost, the metal-oxide-semiconductor (or triode) that present constant-current driven chip producer on the market all will control electric current is integrated in constant-current driven chip inside, the LED constant-current driven chip of the built-in metal-oxide-semiconductor of multichannel that height of formation is integrated.Although the constant-current driven chip of this Highgrade integration can be simplified circuit structure, but after metal-oxide-semiconductor is integrated in constant-current driven chip inside, unnecessary voltage acts directly on the pin pin of constant-current driven chip on the LED lamp bar, with the electric current that flows through metal-oxide-semiconductor, produce thermal losses, the constant-current driven chip temperature is risen.The constant-current driven chip that existing 8 passages even 16 passages integrate, the excess Temperature when working in the LED-backlit drive circuit is easy to exceed normal use specification, and this can affect the performance of product, reduces widely stability and the reliability of product.
Summary of the invention
The object of the present invention is to provide a kind of method that solves the constant-current driven chip excess Temperature, the method is distributed to thermal losses of the prior art on many constant-current driven chips, and then the working temperature of reduction constant-current driven chip, stability and the reliability of raising product.
Another object of the present invention is to provide a kind of LED lamp bar drive circuit, this circuit adopts twin-channel constant-current driven chip, can effectively reduce the temperature of single constant-current driven chip, reduce the working temperature of constant-current driven chip, improve stability and the reliability of product.
For achieving the above object, the invention provides a kind of method that solves the constant-current driven chip excess Temperature, may further comprise the steps:
Step 1, several constant-current driven chips, described constant-current driven chip are provided is that the binary channels constant current drives chip, and described every constant-current driven chip has: the first input pin, the second input pin, the first output pin, the second output pin and control pin;
Utilize many twin-channel constant-current driven chips to replace the constant-current driven chip of Highgrade integration in the prior art, disperse thermal losses, and then reduce the working temperature of constant-current driven chip, improve stability and the reliability of product.
Described every constant-current driven chip is integrated with two field-effect transistors or two triodes, controls conducting or the disconnection of corresponding LED lamp bar by this field-effect transistor or triode, and is safe and reliable.
Described control source output high level or low level, and then the conducting of the field-effect transistor in the control constant-current driven chip or triode or cut-off, described high level is the voltage in the time drain electrode greater than this field-effect transistor conducting, and greater than the threshold voltage of field-effect transistor, can guarantee well this field-effect transistor normally or cut-off.
The resistance of described resistance is according to the required brightness settings of LED lamp bar, and then can control and flow through LED lamp bar electric current, and then the luminosity of control LED lamp bar.
The present invention also provides a kind of LED lamp bar drive circuit, comprise: power supply, two LED lamp bars, the binary channels constant current drives chip, two resistance and control source, described each LED lamp bar has an anodal and negative pole, described constant-current driven chip has: the first input pin, the second input pin, the first output pin, the second output pin and control pin, the positive pole of a described LED lamp bar is connected to power supply, negative pole is connected to the first input pin of a constant-current driven chip, the positive pole of described another LED lamp bar is connected to power supply, negative pole is connected to the second input pin of this constant-current driven chip, a described resistance one end is connected to the first output pin of this constant-current driven chip, the other end connects ground wire, one end of described another resistance is connected to the second output pin of this constant-current driven chip, the other end connects ground wire, and described control pin is electrically connected to the control source.
Utilize many twin-channel constant-current driven chips to replace the constant-current driven chip of Highgrade integration in the prior art, disperse thermal losses, and then reduce the working temperature of constant-current driven chip, improve stability and the reliability of product.
Described every constant-current driven chip is integrated with two field-effect transistors or two triodes, controls conducting or the disconnection of corresponding LED lamp bar by this field-effect transistor or triode, and is safe and reliable.
Described control source output high level or low level, and then the conducting of the field-effect transistor in the control constant-current driven chip or triode or cut-off, described high level is the voltage in the time drain electrode greater than this field-effect transistor conducting, and greater than the threshold voltage of field-effect transistor, can guarantee well this field-effect transistor normally or cut-off.
The resistance of described resistance is according to the required brightness settings of LED lamp bar, and then can control and flow through LED lamp bar electric current, and then the luminosity of control LED lamp bar.
Beneficial effect of the present invention: the present invention solves the Highgrade integration constant-current driven chip that the method for constant-current driven chip excess Temperature adopts many twin-channel constant-current driven chips to replace 8 passages of the prior art or 16 passages and comes driving LED lamp bar, by reducing the number of channels of single constant-current driven chip, and then reduce the working temperature of single constant-current driven chip, guarantee the performance of product, solve the heating problem that the constant-current driven chip Highgrade integration brings, improve stability and the reliability of product; LED lamp bar drive circuit of the present invention adopts twin-channel constant-current driven chip, can effectively reduce the caloric value of single constant-current driven chip, reduces the working temperature of constant-current driven chip, improves stability and the reliability of product.
In order further to understand feature of the present invention and technology contents, see also following about detailed description of the present invention and accompanying drawing, yet accompanying drawing only provide with reference to and the explanation usefulness, the present invention is limited.
Description of drawings
Below in conjunction with accompanying drawing, by the specific embodiment of the present invention is described in detail, will make technical scheme of the present invention and other beneficial effect apparent.
In the accompanying drawing,
Fig. 1 is the constant-current driven chip connection diagram of 8 passages in the prior art book;
Fig. 2 is the flow chart that the present invention solves the method for constant-current driven chip excess Temperature;
Fig. 3 is the connection diagram of constant-current driven chip among the present invention.
Embodiment
Technological means and the effect thereof taked for further setting forth the present invention are described in detail below in conjunction with the preferred embodiments of the present invention and accompanying drawing thereof.
See also Fig. 2 and 3, the invention provides a kind of method that solves the constant-current driven chip excess Temperature, may further comprise the steps:
Step 1, provide several constant-current driven chips 30, described constant-current driven chip 30 drives chip for the binary channels constant current, and described every constant-current driven chip 30 has: the first input pin 1, the second input pin 3, the first output pin 2, the second output pin 4 and control pin 5;
Described every constant-current driven chip 30 is integrated with two field-effect transistors (Q1 and Q2) or two triodes (Fig. 3 is take field-effect transistor as example), and then realizes binary channels control, and is safe and reliable.
The brightness settings that the resistance of described resistance R is required according to LED lamp bar 20, and the resistance of these several resistance R can be identical, also can be different.If the resistance of these several resistance R is identical, then the luminosity of these several LED lamp bars 20 is the same, if the resistance of these several resistance R is not identical, then the luminosity of these several LED lamp bars 20 is inconsistent, thereby can be applied to various occasion, builds atmosphere.
Described constant-current driven chip 30 also comprises two voltage comparator D1 and D2, the output pin of each voltage comparator D1/D2 is electrically connected to the grid g of the field-effect transistor Q1/Q2 corresponding with this voltage comparator D1/D2, the drain electrode d of negative pin and this field-effect transistor Q1/Q2 is electrically connected, and positive pin is used for being electrically connected with control source 10.Described control source 10 output high level or low levels, this high level is the voltage on the time drain electrode d greater than this field effect transistor Q1/Q2 conducting, and the threshold voltage greater than field-effect transistor Q1/Q2, and then can control field-effect transistor Q1/Q2 in the constant-current driven chip 30 or conducting or the cut-off of triode: when the 10 output high level of control source, voltage on the positive pin of voltage comparator D1/D2 is higher than the voltage on the negative pin, field-effect transistor Q1/Q2 conducting corresponding to then output pin output high level, and then control; When 10 output low level of control source, the voltage on the positive pin of voltage comparator D1/D2 is less than or equal to the voltage on the negative pin, the field-effect transistor Q1/Q2 cut-off that then output pin output low level, and then control is corresponding.
As replacing the highly integrated constant-current driven chip of 8 passages, adopt 4 binary channels constant currents to drive chip 30, repeating step 3 three times then can be realized the connection of 8 LED lamp bars; As replacing the highly integrated constant-current driven chip of 16 passages, adopt 8 binary channels constant currents to drive chip 30, repeating step 3 seven times then can be realized the connection of 16 LED lamp bars.
Utilize conducting or the cut-off of control source 10 output high level or low level control field-effect transistor Q1/Q2, and then conducting or the disconnection of control LED lamp bar 20, safe and reliable.
The thermal losses of the constant-current driven chip of Highgrade integration of the prior art is distributed to many binary channels constant currents to be driven on the chip 30, reduce the working temperature of single constant-current driven chip 30, solve the heating problem that the constant-current driven chip Highgrade integration brings in the prior art, improved stability and the reliability of product.
The method can be applied to the fields such as the backlight drive of liquid crystal display and LED illumination.
See also Fig. 3, the present invention also provides a kind of LED lamp bar drive circuit, comprise: power supply 40, two LED lamp bars 20, the binary channels constant current drives chip 30, two resistance R and control source 10, described each LED lamp bar 20 has an anodal and negative pole, described constant-current driven chip 30 has: the first input pin 1, the second input pin 3, the first output pin 2, the second output pin 4 and control pin 5, the positive pole of a described LED lamp bar 20 is connected to power supply 40, negative pole is connected to the first input pin 1 of a constant-current driven chip 20, the positive pole of described another LED lamp bar 20 is connected to power supply 40, negative pole is connected to the second input pin 3 of this constant-current driven chip 20, a described resistance R one end is connected to the first output pin 1 of this constant-current driven chip 30, the other end connects ground wire, one end of described another resistance R is connected to the second output pin 4 of this constant-current driven chip 30, the other end connects ground wire, and described control pin 5 is electrically connected to control source 10.
By using LED lamp bar drive circuit of the present invention, can adopt the binary channels constant current to drive chip 30 and replace multichannel Highgrade integration constant-current driven chip in the prior art, the thermal losses of highly integrated constant-current driven chip of the prior art is distributed to many binary channels constant currents to be driven on the chips 30, reduce the working temperature of single constant-current driven chip, solve the heating problem that the constant-current driven chip Highgrade integration brings in the prior art, improved stability and the reliability of product.As replacing the highly integrated constant-current driven chip of 8 passages, adopt 4 binary channels constant currents to drive chip 30, according to above-mentioned connection, then can realize the connection of 8 LED lamp bars 20, as shown in Figure 3; As replacing the highly integrated constant-current driven chip of 16 passages, adopt 8 binary channels constant currents to drive chip 30, according to above-mentioned connection, then can realize the connection of 16 LED lamp bars 20.
Described every constant-current driven chip 30 is integrated with two field-effect transistors (Q1 and Q2) or two triodes, and then realizes binary channels control.Described control source 10 output high level or low levels, and then the field-effect transistor (Q1/Q2) in the control constant-current driven chip 30 or conducting or the cut-off of triode, described high level are the voltage on the drain electrode d during greater than this field-effect transistor Q1/Q2 conducting.
Described constant-current driven chip 30 also comprises two voltage comparator D1/D2, the output pin of each voltage comparator D1/D2 is electrically connected to the grid g of the field-effect transistor Q1/Q2 corresponding with this voltage comparator D1/D2, the drain electrode d of negative pin and this field-effect transistor Q1/Q2 is electrically connected, and positive pin is used for being electrically connected with control source 10.Described control source 10 output high level or low levels, this high level is the voltage on the time drain electrode d greater than this field-effect transistor Q1/Q2 conducting, and the threshold voltage greater than field-effect transistor Q1/Q2, and then can control field-effect transistor Q1/Q2 in the constant-current driven chip 30 or conducting or the cut-off of triode: when the 10 output high level of control source, voltage on the positive pin of voltage comparator D1/D2 is higher than the voltage on the negative pin, field-effect transistor Q1/Q2 conducting corresponding to then output pin output high level, and then control; When 10 output low level of control source, the voltage on the positive pin of voltage comparator D1/D2 is less than or equal to the voltage on the negative pin, the field-effect transistor Q1/Q2 cut-off that then output pin output low level, and then control is corresponding.
The brightness settings that the resistance of described resistance R is required according to LED lamp bar 20, and the resistance of these several resistance can be identical, also can be different.If the resistance of these several resistance R is identical, then the luminosity of these several LED lamp bars 20 is the same, if the resistance of these several resistance R is not identical, then the luminosity of these several LED lamp bars 20 is inconsistent, thereby can be applied to various occasion, builds atmosphere.
This drive circuit can be applied to the fields such as the backlight drive circuit of liquid crystal display and LED lighting circuit.
In sum, the invention provides a kind of method that solves the constant-current driven chip excess Temperature, the Highgrade integration constant-current driven chip that adopts many twin-channel constant-current driven chips to replace 8 passages of the prior art or 16 passages comes driving LED lamp bar, by reducing the number of channels of single constant-current driven chip, and then reduce the working temperature of single constant-current driven chip, guarantee the performance of product, solve the heating problem that the constant-current driven chip Highgrade integration brings, improve stability and the reliability of product; LED lamp bar drive circuit of the present invention adopts twin-channel constant-current driven chip, can effectively reduce the caloric value of single constant-current driven chip, reduces the working temperature of constant-current driven chip, improves stability and the reliability of product.
The above for the person of ordinary skill of the art, can make other various corresponding changes and distortion according to technical scheme of the present invention and technical conceive, and all these changes and distortion all should belong to the protection range of claim of the present invention.
Claims (8)
1. a method that solves the constant-current driven chip excess Temperature is characterized in that, may further comprise the steps:
Step 1, several constant-current driven chips, described constant-current driven chip are provided is that the binary channels constant current drives chip, and described every constant-current driven chip has: the first input pin, the second input pin, the first output pin, the second output pin and control pin;
Step 2, provide control source, power supply and several LED lamp bar and several resistance corresponding with constant-current driven chip quantity, described every LED lamp bar to have positive pole and a negative pole;
Step 3, the positive pole of a LED lamp bar is connected to power supply, negative pole is connected to the first input pin of a constant-current driven chip, the positive pole of another LED lamp bar is connected to power supply, negative pole is connected to the second input pin of this constant-current driven chip, simultaneously a resistance one end is connected to the first output pin of this constant-current driven chip, the other end connects ground wire, an end of another resistance is connected to the second output pin of this constant-current driven chip, the other end connects ground wire, and the control source is connected to the control pin;
Step 4, repeating step 3 are until connect the quantity of required LED lamp bar;
Step 5, connection control source and power supply utilize the control source to control conducting or the disconnection of corresponding LED lamp bar.
2. the method for solution constant-current driven chip excess Temperature as claimed in claim 1 is characterized in that, described every constant-current driven chip is integrated with two field-effect transistors or two triodes.
3. the method for solution constant-current driven chip excess Temperature as claimed in claim 2, it is characterized in that, described control source output high level or low level, and then the conducting of the field-effect transistor in the control constant-current driven chip or triode or cut-off, described high level is the voltage in the time drain electrode greater than this field-effect transistor conducting, and greater than the threshold voltage of field-effect transistor.
4. the method for solution constant-current driven chip excess Temperature as claimed in claim 1 is characterized in that, the resistance of described resistance is according to the required brightness settings of LED lamp bar.
5. LED lamp bar drive circuit, it is characterized in that, comprise: power supply, two LED lamp bars, the binary channels constant current drives chip, two resistance and control source, described each LED lamp bar has an anodal and negative pole, described constant-current driven chip has: the first input pin, the second input pin, the first output pin, the second output pin and control pin, the positive pole of a described LED lamp bar is connected to power supply, negative pole is connected to the first input pin of a constant-current driven chip, the positive pole of described another LED lamp bar is connected to power supply, negative pole is connected to the second input pin of this constant-current driven chip, a described resistance one end is connected to the first output pin of this constant-current driven chip, the other end connects ground wire, one end of described another resistance is connected to the second output pin of this constant-current driven chip, the other end connects ground wire, and described control pin is electrically connected to the control source.
6. LED lamp bar drive circuit as claimed in claim 5 is characterized in that, described every constant-current driven chip is integrated with two field-effect transistors or two triodes.
7. LED lamp bar drive circuit as claimed in claim 6, it is characterized in that, described control source output high level or low level, and then the conducting of the field-effect transistor in the control constant-current driven chip or triode or cut-off, described high level is the voltage in the time drain electrode greater than this field-effect transistor conducting, and greater than the threshold voltage of field-effect transistor.
8. LED lamp bar drive circuit as claimed in claim 5 is characterized in that, the resistance of described resistance is according to the required brightness settings of LED lamp bar.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210457421.8A CN102917516B (en) | 2012-11-14 | 2012-11-14 | Method for resolving excess temperature of constant current driving chips and light-emitting diode (LED) lamp bar driving circuit |
| US13/807,718 US20140152195A1 (en) | 2012-11-14 | 2012-11-25 | Method for Overcoming Excessively High Temperature of Constant Current Driving Chip and LED Light Bar Driving Circuit |
| DE112012007136.0T DE112012007136T5 (en) | 2012-11-14 | 2012-11-25 | Method for avoiding overheating of a constant current driver module and drive circuit for LED light strips |
| PCT/CN2012/085229 WO2014075341A1 (en) | 2012-11-14 | 2012-11-25 | Method for solving overtemperature of constant current drive chips and led lamp strip drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210457421.8A CN102917516B (en) | 2012-11-14 | 2012-11-14 | Method for resolving excess temperature of constant current driving chips and light-emitting diode (LED) lamp bar driving circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102917516A true CN102917516A (en) | 2013-02-06 |
| CN102917516B CN102917516B (en) | 2015-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210457421.8A Expired - Fee Related CN102917516B (en) | 2012-11-14 | 2012-11-14 | Method for resolving excess temperature of constant current driving chips and light-emitting diode (LED) lamp bar driving circuit |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20140152195A1 (en) |
| CN (1) | CN102917516B (en) |
| DE (1) | DE112012007136T5 (en) |
| WO (1) | WO2014075341A1 (en) |
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| CN109166532A (en) * | 2018-09-21 | 2019-01-08 | 深圳创维－Rgb电子有限公司 | A kind of dimming control system of backlight, dimming controlling method and display device |
| CN112785971A (en) * | 2020-03-18 | 2021-05-11 | 海信视像科技股份有限公司 | Display device and negative-pressure step power supply circuit |
| CN112785971B (en) * | 2020-03-18 | 2022-03-18 | 海信视像科技股份有限公司 | Display device and negative-pressure step power supply circuit |
| US11783788B2 (en) | 2020-03-18 | 2023-10-10 | Hisense Visual Technology Co., Ltd. | Display apparatus and display control method |
| US11825577B2 (en) | 2020-08-24 | 2023-11-21 | Hisense Visual Technology Co., Ltd. | Display apparatus and step power circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| US20140152195A1 (en) | 2014-06-05 |
| WO2014075341A1 (en) | 2014-05-22 |
| DE112012007136T5 (en) | 2015-08-06 |
| CN102917516B (en) | 2015-04-29 |
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